Illuminating apparatus



E. A. HAWTHORNE. ILLUMINATING APPARATUS.

I APPLICATION FILED DEC-5,1917.

1,402,353., Patented Jan. 3, 1922.

's SHEETS-SHEET 1.

E. A. HAWTHORNE. ILLUMINATING APPARATUS.

APPLICATION FILED IJEc.6. I9II. 134029353, Patented Jan. 3, 1922.

. 4% I om MIHWMMHW I I E. A. HAWTHORNE.

ILLUMINATING APPARATUS.

APPLICATION FILED DEC, 1917.

Patented Jan. 3, 1922.

3 SHEETS-SHEET 3.

PATENT FHQ.

ILLUJEHNATING APPARATUS.

incassa.

l Specification of Letters Patent.

Fatented Jan. 3, 1922.

Application led December 6, 1917. Serial No. 205,714.

T 0 all whom t may concern.'

Be it known that ELLswonrH A.. HAW- THORNE, a citizen ot the United States, and a resident of Bridge Jort, county et Fairfield, and State ot' Jonnecticut, have invented an Improvement in illuminating Ap'- paratus, ot which the following description, in connection with the accompanying drawings, is a specification, like characters on the drawings representing like parts.

' This invention relates to illuminating apparatus, and is more especially concerned with a headlamp or searchlamp having a combined switch and focusing device for the control ot an electric lamp associated with suitable light-concentrating and projecting means. c y

My invention will be best `understood by reference to the following description, when taken in connection with the accompanying drawings of one specific embodiment thereof, Vwhile its scope will be more particularly pointed out in the appended claims.

In the drawings: p

Fig. 1 is a central, longitudinal section, partly in elevation, of a searchlamp equipped with a combined switch and focusing device embodying my invention;

Fig. 2 is a front elevation ot the switch; v

F -8 is a sectional view online 3 3 of Fig. 1, looking toward the left;

Fig. 4 is a central, longitudinal section of the combined switch and focusing device on an enlarged scale, and partly broken away;

Fig. 5 is a sectional view on line 5-5 of Fig. 4, looking toward the right;

Fig. 6 is a sectional view on line 6-6 of 4, looking toward the lett;V

Fig. 7 is a sectional view on line 7-7 ol` Fig. 4, looking toward the right;

Fig. 8 is a sectional View on line 8 8 of Fig. 7, looking `in the direction ot the arrows; y Figs-9, 10 and 11 are diagrammatic Iviews showing the lighting circuit in three'positions of theswitch, the'lirst showing theV lswitch positioned for the lighting of one therein a suitable concave reflecting surface 13 which may be and herein is formed as a separate reflector mounted within the casing, and separated from the rear portion ot the latter by a chamber 14. The casing may be and herein is provided with a handle 15, by means of which it may be manipulated, and in the present example, this handle is provided with a chamber 16.

1 Mounted within and cooperating with the reflector 13 is an electric lamp 17 having a b ase 18, which may be and herein is of the commercially known Ediswan type, provided with a pair of laterally projecting pins 19 engaging bayonet slots 2O in a socket 21. The latter is mounted to move axially with reference to the reflector 13, and to that end, the latter is herein provided with a central aperture 22 and a lierrule 25 constituting a guide for lthe socket. It desired, there may be also provided a second lamp 24 having a base 25provided with laterally projecting pins 26 engaging bayonet slots 27 in a socket 28, this lamp, however, being merely an auxiliary or pilot lamp.

i I will now describe in a general way the switch which per se forms the subject matter or"` another application Serial No. 205, v728, filed by John H. George, December 6, 1917. This switch, which it will be understood is selected merely for purposes of exempliicatiom comprises two co-axially disposed, relatively rotatable units 29 and 30.' The unit 29- which is non-rotatable, carries the lamp socket 21 which is secured thereto, and also carries a pair of contacts 31 and 32 connected by usual spring-pressed pins 33 and 34 to the usual terminals of the lamp 17 in a well-known manner. The unit '29 also carries a set of three contacts 35,

36 and 37, the contacts 35 and 36 being connected by conducting wires 38 and 39 with the pilot lamp 24, and the contacts 35 and 37 being connected by wires 40 and 41 with asuitabl'e source ot current not shown. The rotatable unit 30 carries a set of three contact plates 42, 43 and 44, the plates 43 vand 44 being connected'to each other by an integral conductor 45.

.By reference to Figs. V9, 10 and 11, it will be observed that the plate 42, when swung from the position shown in Fig. 10 to the position shown in Fig. 9, makes Contact with the contact members 32 and 35. Likewise, when the switch is in this position, the conplopriate means. `s uchlmeans comprises a pin or rivet 52, which tact plate 44 makes contact with the contact plates 31 and 37. Hence, at this time, a circuit is completed to the lamp 17. lllhen, on the other hand, the movable contacts are turned from the position shown in Fig. `9l to the position shown in Fig. 10, the Contact plates 42 and 44 are carried out of contact with their-respective pairs of contact mem# bers 32, 35, and 31, 37, so that the circuit of the lamp 17 is broken. Vhen, now, the

movable contacts are turned from the position shown in Fig. 10 to that shown in Fig. 11, the contact plate 44 contacts with the contact member 36, while the lcontactplate 43 contacts with the contact ymember 37, and as said contact plates are connected by the conductor 45, a circuit is completed to the pilot bulb- 24. Y

As a means for holding the unit 29-against rotation to allow the same to be moved axi ally to adjust the focus of the lamp 17 which ,it carries, said unit is herein provided with a rearwardly extending hub or boss 46, suitably interengaging with a collar 47 which is fixed against rotation. To this end, the hub or boss 40 in the present example is in the form of a prism, and fits a correspondingly-shaped aperture 48 in the collar 47, while the latter is suitably secured to the casing 12, as by electrically spot-welding the same thereto. It is now evident that by moving the switch bodily in an axial direction in the ferrule and collar 47 which constitute guides therefonthe lamp 17 may be moved axially with relation to the reflector 13, thereby to vary the character of the beam. It is also evident that sine the unit 29 is held against rotation, the conducting wires leading thereto do not swing to and fro when the switch is turned on and off.

I have herein provided a single lampfocusing and switch-operating means mounted to move axially and turn in the casing 12,

ysuch means comprising` a preferably metallic member 49, suitably secured to the switch unit 30, which is preferably formed of insulating material. In the present instance, the

member 49 is Aprovided with a plurality of laterally project-ing prongs 50, and the unit 30 is formed by molding the same about the .terminal portion of the member 49 in such .ingthe member 49 in the form of a tube in Iwhich a .rod 51 is adjustably secured by ap- In the present example,

may be placed invany onejofpa series-of holes 53 in the tube 49, and any one of a series of holes 54 in the rod 5 1.

The rodv 51 extends rearwardly through the handle 15 to the exteriorthereof, where it is provided with a suitable handle in the form of a knob 55 secured thereto in any appropriatemanner. In the present example, the rod 5l isprovided with a polygonal por tion 56, fitting into a correspondingly-shaped opening 57 in thefknob 55, therebypreventing the latter from turning on the rod, while a screw 58, threaded int-o the rod and having its head bearing against the; knob, forces the latter against a shoulder 59 on the rod,-and se :ures the knob to the rod. Byv grasping the knob and turning the samein the proper direction, the switr-hmay be operated tof make or break either lamp circuit, while on the other hand, by pushing or pulling the knob,

the lamp 17 may be focused. Either of these increments may be availed of without inter- -fering in any way with the other, `and both operations may be carried out at the same time, thus effecting asaving oftime.

In order that the rod51 may be secured against axial movement, thereby to l maintain a given focal position of the lamp while still allowed Vt0 turn in'order Vto operate the switch, I have herein provided a sleeve (50, encircling the rod 51 and held against axial movement thereon by suitable means, herein comprising a ring 61 located Ain a groove 62 in the rod 51 at theforward end of the tube 60, while the rear end ofthe latter bears against the inner end of itlie knob 55. Thus the tube is restrained against longitudinal movement, butV is allowed @to turn freely on'tlie rod, or ratheigthe latter is free to turn within the tube. This tube may be secured and the lamp 17 held in the desired position, while still allowing the switch to be operated, by turning the rod within thetube. The latter may be secured by any suitablemeanspbut I prefer to employ for this purpose a clamping Vder-vice which forms the subject matter of another application, Serial No. 200,243, filed by me November 5, V1917. This` clamping device as herein employed comprises a collar ,63, which is rendered Vexpansible and contractible by providing the same with Aone or more longitudinal slots 64. This collar -is provided with a tapered portion 65, `located within a correspondingly tapered portion 66 of a fixed bushing 67, through which the collar 63 extends to the exterior of the casing, where'it is provided with a nut V68 threaded onto the collar and adapted to move the latter axially,tthereby toexpand or contract the same and cause it to clamp or releaseithe tube at will. vThe nut68is here-Y in `providedwith a knob 69, having vtherein a chamber 70 and :the Vknob 55 is provided with a boss or hub 70, which extends y into said chamber, as shown in Fig. 5. The knob 69 constitutes a stop, cooperating with the knob to limit inward movement of the switch and the lamp carried thereby, while outward movement is limited by the ring which brings up against the front end of the collar 63. By limiting the forward movement, I am enabled to avoid the possibility of breakage of the glass tip of the lamp which might otherwise occur if the same were to strike the lens or glazing of the lamp. @n the other hand, by limiting the movement in a rearward direction, I am enabled to avoid the possibility of breaking the lamp by causing the latter to strike against the reflector 13. A

lVhile I have herein shown and described one specific embodiment of my invention for. illustrative purposes, and have disclosed and discussed in detail the construction and arrangement incidental to one specific application thereof, it is to be understood that the invention is limited neither to the mere details or relative arrangement of parts, nor

to its specific embodiment herein shown, but that extensive deviations from the illustrated form or embodiment of the invention may be made, without departing from the principles thereof.

Having thus described my invention, what I claim and desire by Letters Patent to secure is:

l. In a lighting apparatus, the combination of a casing having a concave reflector therein, a lamp-focusing and switch-operating member mounted t0 turn and move axially in said casing, a lamp-controlling switch -carried by the forward end of said member and comprising two members, one of which is secured to and turned by said rst mentioned member, and the other of which is provided with a rearwardly extending boss, a collar secured to said casing and having means to hold said boss against turning movement while permitting axial movement thereof, and a lamp carried by said switch within said reflector.

3. In a lighting apparatus, the combination of a casing having a concave reflector therein, a lamp-focusing and switch-operating member mountedto turn and move axially in said casing, a lamp-controlling switch carried by the forward end of said member and comprising two members, one of which is secured to and turned by said first mentioned member, and the other of which interengages with and is held against turning movement by said casing but slides axially therein, one or more conducting wires secured to such other member, and a lamp carried by said switch within said reflector.

4. In a lighting apparatus, the combination of a casing having a reflector therein, a lamp cooperating with said reflector, and lamp-focusing means connected to said lamp, said means including two members, one of which is mounted to slide longitudinally of the other to vary the eiective combined length of said members, and a fastening element extending through one of said members into the other adjustably to secure said members fixedly to each other in proper relation for operation of said means from the exterior of said casing.

5. In a lighting apparatus, the combination of a casing having a reflector therein, a lamp cooperating with said reflector, and lamp-focusing means connected to said lamp, said means including two members, one of which is mounted to slide longitudinally within the other and one of which is provided with a longitudinal series of holes, and a fastening` element engageable with any one of said holes adjustably to secure said members to each other in proper relation for operation from the exterior of said casing.

In testimony whereof, I have signed my name to this specification.

ELLSWORTH A. HAWTHORNE. 

